Automatic cylinder cock



April 28, 1925. u 1,535,631

R. H. SMITH AUTOMATIC CYLINDER c0011 Filed July 25', 1922 1/ mummu 14 /51 y r [a4 /6 jg 2 f0 g M I f? 1? H 451m 2 1 Patented Apr. 28, 1925.

, UNlTED STAT-ES 1,535,631 A E T, OFFICE".

1 ROBERT H. SMITH, or coL MB s, GEORGIA.

AUTOIYIA'IIC CYLINDER COCK. l

Application filed July 25, 1922. Serial No. 577,375.

To all whom it may concern: 1

Be it known that I, Roenn'r H. SMITH, citizen of the United States,residing at C0- lumbus, in the county of Muscogee and State of Georgia,have invented certain new and useful Improvements in Automatic CylinderCocks, of which the following is a'specitication. -i

This invention relates to an improved automatic cylinder cock, being'oarticularly designed for use upon locomotives, and seeks, as one ofits principal objects, to provide a device of this character whereinwhenthe steam pressure 1 in the locomotive cylinders is relieved, the'cockwill automatically open for draining the cylinders.

A further object of the invention is to provide a cylinder cock wherein,when steam -is admitted to the locomotive cylinders, the

cock will be automatically closed.

And the invention has as a still further object to provide a cockwherein, when desired, the cock may be manually opened.

Other and incidental objects will appear hereinafter.

In the drawings:

Figure 1 is a fragmentary side elevation showing my improved cock inconnection with a locomotive.

Figure 2 is a vertical sectional view through the cock.

Figure 3 is a vertical sectional view at substantially right angles toFigure 2, and

Figure dis a transverse sectional view on the line 1-4 of Figure 2,looking in the direction of the arrows.

In carrying the invention into effect, I employ a casing 10 provided atits upper end with a nipple 11 and leading downwardly within the casingfro-m said nipple are oppositely disposed exhaust passages 12 defining acentrally disposed core 13 within the casing. At their lower ends, thepassages 12 enter a chamber let and threaded through the bottom wall ofthe casing is a plug 15 closing said chamber, this plug being providedwith a frusto-conical inner end face 16. Formed in the core from thelower end thereof is an axially disposed valve chamber 17 at the lowerend of which the core is provided with a beveled valve seat 18 andleading from the chamber through a suitable web 19, is an outlet passage20 opening through the wall of the'casing. Arranged to coact with thevalve seat 18 of the core is a valve 21 having a stem 22 extendingupwardly within the valve chamberi l l and radiating from said ste n arespacedvanes 23 slidahly coacting withthe wall of the chamber forcentering the valve therein. Formed through the casing 10 and throughthe core 13 above the valve chamber 17, at

substantially right angles to the outlet passage 20, is an opening orslot 24 communicating With the valve chamber and slidable through saidopening is an operating bar 25 in which is formed an elongated notch 26having a cam face 27 sloping the lower edge of the bar.

In use,- a pair. of the cooks, is employed upon each cylinder of thelocomotive' In Figure 1 of the drawings, I have conventionally shown alocomotive at 28, the cylinder at the adjacent side of the locomotivebeing indicated at 29. As will be observed,

' the nipples 11 of the drain cocks are threaded through the wall of thecylinder at its lowerside and inmounting said cooks, the openings 24therethrough are brought into alinement so that the bar 25 may extendfreely through the openings of both cocks. Accordingly, the notch 26 andcam face 27 upon the bar are duplicated at each cock and mounted uponthe rear end of the cylinderis a bracket 30 upon which is pivoted alever 31 connected at its lower end with the rear end of the bar.Suitably mounted within the locomotive cab is a pivoted operating lever32 and extending between the lower end of this lever and the upper endof the lever 31 is a reach rod 33.

Normally, the lever 32 will stand at the position shown in Figure 1,when the notches 26 in the bar will be disposed over the valve stems 22of the cooks so that said stems may rise into said notches and permitthe valves 21 to move to closed position in engagement with the seats18. Accordingly, when steam is admitted to the cylinder 29, the steamwill flow through the passages 12 of the cocks to enter the chambers 14beneath the valves, the steam striking the frusto-co-nical faces 16 ofthe plugs 15 to be deflected upwardly thereby against the valves forlifting the valves to closed position. Steam pressure beneath the valveswill then serve to hold the valves closed until the supply of steam tothe cylinder is cut off. hen this occurs, the valves 21 will drop bygravity to rest against the plugs 15 so that the cylinder may then drainthrough the passages 12 of the cooks,

gradually to the valve chambers Y17 and outlet passages 20. Accordingly,as will be seen, the valves will be automatically closed by steampressure and will automatically open by gravity when the steam pressureis relieved. To manually open the valves of the cooks, the lever 32 isrocked forwardly which will, as will be at once understood, result inslidably shifting the bar 25 forwardly. The cam faces 27 of the bar willthus be caused to passages leading downwardly within the casing atopposite sides thereof and connected at their lower ends by a chambercommon thereto, said passages defining an intervening core having anaXial valve chamber opening at its lower end into the former chamber andthe casing being tormed with an outlet passage extending across one ofsaid first mentioned passages as Well as with a slot extending throughthe casing and through said core at substantially a right angle to saidoutlet passage, a downwardly opening valve slidable in said valvechamber but normally held elevated in closed position by steam pressure,the valve being provided with a stem to project into said slot, and abar slidably fitting through said slot and provided with an inclinedface to coact with the valve stem for depressing the valve to openposition when the bar is shifted.

In testimony whereof I aflix my signature.

ROBERT H. SMITH. [as]

